Jug Pencil
A scale is made of equal intervals. The label on a major mark tells how much each interval represents.
Before you try
Before you play, make a prediction: A water level at three 100 mL intervals is… Explain what you expect and what part of the model will help you check it.
Try it out
Interactive activity
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What happened?
Move a control to see what changes and why.
The game practises one idea at a time with simple drawn pictures. Check the same idea with real objects and your NCERT textbook (Chapter 8: Weigh It, Pour It, pages 115–127).
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Try these ideas
- Draw a horizontal water level at the requested mark.
- Try a new puzzle with ↻. Describe what changed and which mathematical rule stayed the same.
- Complete a round, then explain your method before you move to the next one.
Why it works
A scale is made of equal intervals. The label on a major mark tells how much each interval represents.
On a jug with 100 mL intervals, halfway between 400 and 600 mL is 500 mL. Draw a horizontal water level at the requested mark.
Read what each interval represents rather than assuming every mark means one unit.
This activity connects to Weigh It, Pour It, NCERT Class 4 maths, printed pages 115–127. Use the picture or objects to explain each step before relying on a calculation. The game practises one part of the chapter at a time; the other three activities extend the chapter’s ideas.
Worked example: A jug is marked 0, 200, 400, 600, 800 and 1000 mL. Where is 500 mL? Neighbouring labelled marks differ by 200 mL. 500 mL is halfway between 400 and 600 mL. Draw a horizontal level there.
Check your understanding
Question 1 of 2
A water level at three 100 mL intervals is…
A quarter of one litre is…
Explain it in your own words
What changed? Why did it happen? Where might you notice this in everyday life?
For parents & teachers
- Try with everyday materials. Draw a horizontal water level at the requested mark. Ask the child to make a new example using paper, counters, household objects or a labelled sketch.
- Listen to the explanation. Read what each interval represents rather than assuming every mark means one unit. Ask “How could we check?” and encourage a second representation of the same idea.